DE3877417D1 - OPTICAL READING HEAD DEVICE. - Google Patents
OPTICAL READING HEAD DEVICE.Info
- Publication number
- DE3877417D1 DE3877417D1 DE8888304549T DE3877417T DE3877417D1 DE 3877417 D1 DE3877417 D1 DE 3877417D1 DE 8888304549 T DE8888304549 T DE 8888304549T DE 3877417 T DE3877417 T DE 3877417T DE 3877417 D1 DE3877417 D1 DE 3877417D1
- Authority
- DE
- Germany
- Prior art keywords
- head device
- reading head
- optical reading
- optical
- reading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
- G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/094—Methods and circuits for servo offset compensation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/133—Shape of individual detector elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62121623A JPS63285732A (en) | 1987-05-19 | 1987-05-19 | Optical pickup device |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3877417D1 true DE3877417D1 (en) | 1993-02-25 |
DE3877417T2 DE3877417T2 (en) | 1993-05-13 |
Family
ID=14815842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8888304549T Expired - Fee Related DE3877417T2 (en) | 1987-05-19 | 1988-05-19 | OPTICAL READING HEAD DEVICE. |
Country Status (4)
Country | Link |
---|---|
US (1) | US4847478A (en) |
EP (1) | EP0292289B1 (en) |
JP (1) | JPS63285732A (en) |
DE (1) | DE3877417T2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4970710A (en) * | 1987-07-29 | 1990-11-13 | Laser Magnetic Storage International Company | Method and apparatus for focus and tracking in an optical disk system |
JPH0770065B2 (en) * | 1988-04-20 | 1995-07-31 | シャープ株式会社 | Optical pickup device |
US5511050A (en) * | 1988-09-21 | 1996-04-23 | Hitachi, Ltd. | Focus error detecting method and optical head using the same |
WO1993010528A1 (en) * | 1991-11-20 | 1993-05-27 | Sony Corporation | Optical disk |
JP3175326B2 (en) * | 1992-08-28 | 2001-06-11 | 凸版印刷株式会社 | Optical information recording medium and information reading method thereof |
US6563101B1 (en) | 2000-01-19 | 2003-05-13 | Barclay J. Tullis | Non-rectilinear sensor arrays for tracking an image |
US6967908B2 (en) * | 2000-09-07 | 2005-11-22 | Pioneer Corporation | Optical pickup device with focus error detecting optical element and method for focus error detection |
JP2009110558A (en) * | 2007-10-26 | 2009-05-21 | Sanyo Electric Co Ltd | Optical pickup device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59125727U (en) * | 1983-02-15 | 1984-08-24 | パイオニア株式会社 | Optical information pickup device |
JPS6055521A (en) * | 1983-09-05 | 1985-03-30 | Mitsubishi Electric Corp | Automatic focus controller of optical disk |
US4742218A (en) * | 1985-03-11 | 1988-05-03 | Hitachi, Ltd. | Focus error detection apparatus utilizing focusing an front and rear sides of focal planes |
JPH0770088B2 (en) * | 1986-12-18 | 1995-07-31 | キヤノン電子株式会社 | Photo detector |
-
1987
- 1987-05-19 JP JP62121623A patent/JPS63285732A/en active Pending
-
1988
- 1988-05-19 EP EP88304549A patent/EP0292289B1/en not_active Expired - Lifetime
- 1988-05-19 US US07/195,972 patent/US4847478A/en not_active Expired - Lifetime
- 1988-05-19 DE DE8888304549T patent/DE3877417T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0292289B1 (en) | 1993-01-13 |
EP0292289A3 (en) | 1990-03-28 |
JPS63285732A (en) | 1988-11-22 |
EP0292289A2 (en) | 1988-11-23 |
DE3877417T2 (en) | 1993-05-13 |
US4847478A (en) | 1989-07-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |